23
5MHz Distribution Amplifiers
Test and calibration.
Check out.
With the instrument plugged into an ac power source and turned “on”, apply a
5MHz (±1kHz or ±100ppm), 1.41V
PP
(+7dBm or 0.5 V
RMS
) sine wave to the 50
Ω
input.
Verify that each of the seven outputs provides a clean sine wave output of 2.82V
PP
on an
oscilloscope when driving a 50
Ω
load.
The output amplitude should decrease by a few percent when the input is changed to 4.9MHz
or 5.1MHz. The SIGNAL LED should go “off” if the amplitude is reduced below 0.4V
PP
.
The OVERLOAD LED should go “on” when the input is increased above 5.2 V
PP
(but do not
exceed 6 V
PP
while testing).
Calibration.
With the instrument plugged into an ac power source and turned “on”, apply a
5MHz (±1kHz or ±100ppm), 1.41V
PP
(+7dBm or 0.5 V
RMS
) sine wave to the 50
Ω
input.
1.
Adjust the core of the tuned transformer (T101) to maximize the amplitude of the
Channel 1 output when driving a 50
Ω
load.
2.
Adjust the amplitude control pot (P100) for 2.82V
PP
(+13dBm or 1.00 V
RMS
) sine
wave amplitude on the Channel 1 output when driving a 50
Ω
load.
3.
Verify that 5MHz is present at each of the seven outputs.
Stanford Research Systems
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